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Title Records of Six Leucosioid Crab Species from the Ryukyu

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Title Records of Six Leucosioid Crab Species from the Ryukyu Records of six leucosioid crab species from the Ryukyu Title Archipelago, Japan Naruse, Tohru; Maenosono, Tadafumi; Uyeno, Daisuke; Author(s) Samejima, Shota; Shirawakawa, Naoki Citation Fauna Ryukyuana, 36: 1-11 Issue Date 2017-05-31 URL http://hdl.handle.net/20.500.12000/38800 Rights Fauna Ryukyuana ISSN 2187-6657 http://w3.u-ryukyu.ac.jp/naruse/lab/Fauna_Ryukyuana.html Records of six leucosioid crab species from the Ryukyu Archipelago, Japan Tohru Naruse1, Tadafumi Maenosono2, Daisuke Uyeno3, Shota Samejima4 & Naoki Shirakawa5 1Tropical Biosphere Research Center, Iriomote Station, University of the Ryukyus, 870 Uehara, Taketomi, Okinawa 907-1541, Japan ([email protected]) 2Kankyosha, 1-4-5 102 Kyozuka, Urasoe, Okinawa 901-2111, Japan 3Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan 4Okinawa Prefectural Sea Farming Center, 853-1 Ohama, Motobu, Okinawa 905-0212, Japan 5Dolphin Kick, Tomari, Naha, Okinawa 900-0012, Japan Abstract. Six species of leucosioid crabs are Measurements refer to as carapace length (CL; reported from the Ryukyu Islands in this paper: distance between levels of frontal margin or distal Arcania sagamiensis Sakai, 1969, Ebalia stellaris ends of spines and posterior margin or distal ends of Naruse & Ng, 2006, Ebaliopsis erosa (A. Milne- spines) × carapace width (CW; maxima width, Edwards, 1873), Myra eudactylus (Bell, 1855), including spines if any) in millimeters. Urnalana elata (A. Milne-Edwards, 1874) (Leucosiidae); and Iphiculus spongiosus Adams & Species account White, 1849 (Iphiculidae). Ebaliopsis erosa are Superfamily Leucosioidea Samouelle, 1819 recorded from Japanese waters for the first time; all Family Leucosiidae Samouelle, 1819 but Ebalia stellaris and M. eudactylus are recorded Arcania sagamiensis Sakai, 1969 from the Ryukyu Islands based on the specimens for [Japanese name: Sagami-toge-kobushi] the first time. Taxonomic notes are also provided for (Fig. 1A) some selected species. Material examined. RUMF-ZC-3785, 1 ovigerous Introduction female, 12.1 × 11.8 mm, Sumuide, Yagaji Island, adjacent to Okinawa Island, intertidal, coll. T. Recent intensive field works mainly by the second Maenosono, 23 Apr. 2016; RUMF-ZC-4266, 1 male, author have contributed much to the discovery of a 9.3 × 8.9 mm, Yakena, Okinawa Island, coll. J. Nawa, number of taxonomically and/or biogeographically 15 Jul. 2007; RUMF-ZC-4267, 1 juvenile, 6.2 × 5.6 interesting brachyuran crabs from the Ryukyu mm, Kaichu-doro, off Okinawa Island, intertidal; Islands (e.g. Naruse & Maenosono 2014; RUMF-ZC-4282, 1 male, 11.3 × 10.5 mm, Yakata, Maenosono 2015a; 2015b; 2016; Maenosono & Onna, Okinawa Island, intertidal, coll. T. Maenosono, Naruse 2015; 2016a; 2016b; Maenosono et al. 2015). 10 Apr. 2009; RUMF-ZC-4283, 1 male, 9.1 × 9.1 In this paper, we report on six species of the mm, Yabuchi Island, adjacent to Okinawa Island, superfamily Leucosioidea, Arcania sagamiensis intertidal, coll. T. Maenosono, 26 Apr. 2009; RUMF- Sakai, 1969, Ebalia stellaris Naruse & Ng, 2006, ZC-4284, 1 female, 13.0 × 12.9 mm, Ukaji, Onna, Ebaliopsis erosa (A. Milne-Edwards, 1873), Myra Okinawa Island, subtidal (> -2 m), coll. T. eudactylus (Bell, 1855), Urnalana elata (A. Milne- Maenosono, 31 Mar. 2010; RUMF-ZC-4285, 1 Edwards, 1874) (Leucosiidae), and Iphiculus juvenile, 4.8 × 4.7 (damaged) mm, Sesoko Island, spongiosus Adams & White, 1849 (Iphiculidae). adjacent to Okinawa Island, subtidal (> -2 m), coll. Ebaliopsis erosa is recorded from Japanese waters T. Maenosono, 11 May 2010; RUMF-ZC-4286, 1 for the first time; all but Ebalia stellaris and M. male, 7.5 × 7.2 mm, Kaichu-doro, off Okinawa eudactylus are recorded from the Ryukyus for the Island, intertidal, coll. T. Maenosono, 28 Oct. 2011. first time. Comparative material. Arcania sagamiensis: Material examined are deposited in the WNHN-NA-Cr.0191, 1 male, 10.2 × 10.0 mm, 1 Department of Zoology (NSMT-Cr) and the Showa female, 13.3 × 13.1 mm, dry, Kamiura, Kushimoto, Memorial Institute (NSMT-R), the National Museum Wakayama Prefecture, intertidal, 10 Aug 1979, coll. of Nature and Science, Tsukuba; Ryukyu University S. Nagai; WNHN-NA-Cr.0191, 1 male, 11.8 × 11.7 Museum, Fujukan (RUMF), University of the mm, dry, Ogasawara Islands, coll. Mr. Ozato, Jun. Ryukyus, Japan; and the Wakayama Prefectural 1988. Museum of Natural History (WMNH), Wakayama. Coloration. Fig. 1A. Carapace and pereopods 1 Fig. 1. Arcania sagamiensis Sakai, 1969, and Ebalia stellaris Naruse & Ng, 2006. A, A. sagamiensis (RUMF-ZC-3785, CL 12.1 mm, ovigerous female, Yagaji Island); B, E. stellaris (RUMF-ZC-4307, CL 2.5 mm, ovigerous female, between Iriomote and Hatoma Islands). 図 1. サガミトゲコブシとホシズナエバリア. A, サガミトゲコブシ (RUMF-ZC-3785, CL 12.1 mm, 抱卵雌, 屋 我地島産); B, ホシズナエバリア (RUMF-ZC-4307, CL 2.5 mm, 抱卵雌, 西表–鳩間島沖産). with whitish base color. Top of both small and large Material examined. RUMF-ZC-4307, 1 ovigerous granules on the dorsal surface of the carapace orange, female, 2.5 × 3.7 mm, between Iriomote and except for whitish granuels on posterolateral to Hatoma Island, 24°26.514′N 123°49.237′E -32 m – posterior margins. 24°26.517′N 123°49.234′E -35 m, dredge, coll. T. Habitat. The present specimens were all Naruse et al., 18 Jul. 2014. collected from lower intertidal to shallow subtidal Comparative material. Ebalia stellaris: NSMT- sandy substratum around seagrass beds, usually Cr 21751, 1 male, 2.5 × 3.1 mm, south off Nagannu mixed with dead coral gravels. Island, Kerama Island group, Ryukyu Islands, Distribution. China (Hainan Island); Taiwan 26°14.34′ N 127°32.66′ E – 26°14.42′ N 127°32.50′ (Siaoliouciou Island); Japan (Okinawa Island; Kii E, -41.4–46.0 m, dredge, TRV Toyoshio Maru 2007 Peninsula; Manazuru Peninsula, Sagami Bay [type cruise, stn 8, coll. H. Komatsu, 25 May 2008; locality]; Ogasawara Islands); Fiji; Western Samoa NSMT-Cr 21752, 1 young female, 3.0 2.3 × 3.0 mm, (Sakai 1969; Marumura 1985; Dai et al. 1986; Galil Ankyaba, Kakeroma Island, Amami Island group, 2001a; Marumura & Kosaka 2003; Lin et al. 2014; Ryukyu Islands, -12 m, sandy bottom, SCUBA, TRV present study). Toyoshio Maru 2003 cruise, coll. T. Akiyama, 26 Remarks. Arcania sagamiensis was described May 2003. based on the specimens collected from Manazuru, Ebalia humilis Takeda, 1977: NSMT-Cr 11298, 1 Sagami Bay (Sakai 1969). The specimens examined male, 2.9 × 3.4 mm, Miyanohama, Chichi-jima in this study morphologically agree well with the Island, Ogasawara Islands, -25 m, SCUBA, coll. H. original description as well as the specimen from Tachikawa, 5 Jan. 1993; NSMT-Cr 18305, 1 ovig. mainland Japan. female, 2.9 × 3.6 mm, Takinoura, Ani-jima Island, Although A. sagamiensis is rather common in the Ogasawara Islands, -8 m, SCUBA, coll. H. above habitat in Okinawa Island, there are only a few Tachikawa, 3 April 1994. distributional records from the northwestern to Coloration. Fig. 1B. Ivory overall. Also see southwestern Pacific. Naruse & Ng (2006) for different color pattern. Habitat. The specimen examined in this study Ebalia stellaris Naruse & Ng, 2006 was collected by dredging on the seabed of dead [Japanese name: Hoshizuna-Ebalia] coral gravels. Naruse & Ng (2006) noted that the (Fig. 1B) holotype was collected from very fine sandy substratum. Range of the depths of known habitat is 2 [記録] 成瀬ら: コブシガニ上科 6 種の琉球列島からの記録 Fauna Ryukyuana, 36: 1–11. Fig. 2. Ebaliopsis erosa (A. Milne-Edwards, 1873). A, RUMF-ZC-4277 (CL 10.0 mm, female, Okinawa Island); B, RUMF-ZC-4279 (CL 8.6 mm, male, Okinawa Island). 図 3. クルミコブシ (新称). A, RUMF-ZC-4277 (CL 10.0 mm, 雌, 沖縄島産); B, RUMF-ZC-4279 (CL 8.6 mm, 雄, 沖縄島産). -12–46 m (Naruse & Ng 2006; Komatsu et al. 2011; Island, intertidal, coll. T. Maenosono, 8 Apr. 2008; this study). RUMF-ZC-4260, 1 female, 11.4 × 10.6 mm, Omine Distribution. Ryukyu Islands (known from Coast, Naha, Okinawa Island, intertidal, coll. T. around islands of Kakeroma, Nagannu, Okinawa Maenosono, 7 May 2008; RUMF-ZC-4261, 1 female, (Nakagusuku Bay) and Iriomote) (Naruse & Ng 10.0 × 8.7 mm, Horikawa, Tamagusuku, Okinawa 2006; Komatsu et al. 2011; this study). Island, intertidal, coll. T. Maenosono, 21 Aug. 2008; Remarks. Ebalia stellaris had been known by an RUMF-ZC-4262, 1 male, 6.4 × 5.3 mm, Noho Island, only female holotype until Komatsu et al. (2011) adjacent to Iheya Island, subtidal, coll. T. reported additional one male and one female Maenosono, 24 Sep. 2008; RUMF-ZC-4263, 1 male, specimens. They showed a striking sexual 4.6 × 3.9 mm, Yamada, Onna, Okinawa Island, dimorphism for E. stellaris and allied E. humilis and intertidal, coll. T. Maenosono, 16 Oct. 2008; RUMF- reassessed the diagnostic characters of the two ZC-4264, 1 female, 10.8 × 9.2 mm, Omine Coast, species; “E. stellaris can be distinguished from E. Naha, Okinawa Island, intertidal, coll. T. Maenosono, humilis by the carapace being 1.5 times broader than 12 Oct. 2008; RUMF-ZC-4265, 1 female, 6.2 × 5.6 long in female (vs. 1.2 times in E. humilis); the mm, Yabuchi Island, adjacent to Okinawa Island, lateral angle of the carapace is smaller than intertidal, coll. T. Maenosono, 26 Oct. 2008; RUMF- metabranchial tooth (vs. larger); the male telson is ZC-4275, 1 female, 11.1 × 9.7 mm, Seragaki, Onna, elongate-triangular (vs. tongue-shaped); the distal Okinawa Island, intertidal, coll. T. Maenosono, 12 part of G2 is straight and directed mesially (vs. Feb. 2009; RUMF-ZC-4276, 1 male, 7.6 × 6.3 mm, curled abdominally)” (Komatsu et al. 2011). The Yakata-katabaru, Onna, Okinawa Island, intertidal, female specimen collected from off Iriomote Island coll. T. Maenosono, 10 Apr. 2009; RUMF-ZC-4277, has diagnostic characters that are applicable for the 1 female, 10.0 × 8.7 mm, Ukaji, Onna, Okinawa female and is identified here as E.
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